I cannot seem to make up my mind on what I want to replace the Mister (fogger) I have now. Of the 3 systems on the title, which is used when? I see this 'chilly-bits' and cold air getting good reviews. which should I run when milling w/ HSS no coatings on Aluminum? Seems like fogless on this one. which should I run when milling w/ HSS , coated, on Aluminum? Cold air sees Ok here? Lately I run a lot of cobalt tooling and seem to buy that over HSS if offered for a few bucks . Steel- Coolant or air? both? ;-) Anyway, Just wondering what other CNC'ers do. of late, mostly aluminum work. Have a great week everyone. CG.